Ballistic Advantage 300Blk - Pistol Length Ar Barrel 10"

The Ballistic Advantage 300 Blackout pistol length AR barrel is a 10-inch upper receiver component built for short-barreled rifle (SBR) and pistol configurations. This 300 Blackout barrel is machined from 4150 Chrome Moly Vanadium steel—a time-proven material for AR barrels that resists wear and handles sustained fire without premature throat erosion. The QPQ corrosion-resistant finish protects against rust and wear in field conditions, and the QPQ-coated M4 feed ramp extension ensures reliable feeding across factory and hand-loaded ammunition variants.

Ballistic Advantage's 300 Blackout barrel brings serious performance to short-range tactical setups, hunting builds, and suppressed carbines. The 1:7 twist rate stabilizes the full spectrum of 300 Blackout loads—from subsonic 220-grain rounds to supersonic 125-grain and everything in between. At 10 inches, the barrel preserves the handling and ballistics you'd expect from pistol-length gas systems while maximizing velocity in a compact footprint.

If you're planning to use this barrel, remember that federal law requires compliance with the National Firearms Act. A 300 Blackout pistol barrel can only be legally possessed and used on a registered short-barreled rifle (SBR), an AOW, a registered machine gun, or a legal pistol configuration firearm. Pairing this barrel with a non-NFA lower receiver—unless that lower itself is legally registered as a pistol—violates federal law. Always verify your local and federal regulations before assembly.

Key Features

• 4150 Chrome Moly Vanadium steel for durability and extended service life
• QPQ corrosion-resistant finish on barrel and M4 feed ramp extension
• 1:7 twist rate optimized for subsonic and supersonic 300 Blackout ammunition
• 10-inch length for compact SBR and pistol builds
• .750" gas block journal for standard AR accessories

Specifications

Frequently Asked Questions

Can I use this barrel on any AR lower receiver?

No. This barrel is legal only on NFA-registered short-barreled rifles, registered machine guns, or legally configured pistol lower receivers. Using it with a standard rifle lower receiver violates federal law. Always verify your build complies with ATF regulations.

What ammunition does this 1:7 twist stabilize?

The 1:7 twist rate handles both subsonic rounds (typically 220 grains) and supersonic loads (125 to 147 grains) reliably. This versatility makes it ideal for suppressed shooting and general-purpose 300 Blackout use.

Is the feed ramp coated the same as the barrel?

Yes. The M4 feed ramp extension features the same QPQ corrosion-resistant finish as the barrel, ensuring consistent protection and reliable feeding.

What gas block will fit this barrel?

Any standard AR gas block sized for .750-inch journal diameter will fit this Ballistic Advantage barrel.